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Barracuda 7200.8 PATA Product Manual, Rev. F
2.8 Power specification s
The drive receives DC power (+5V or +12V) through a four-pin standard drive power connector.
2.8.1 Power consumption
Power requirements for the drives are listed in the table on page 12. Typical power measurements are based
on an average of drives tested, under nominal conditions, using +5.0V and +12.0V input voltage at 25°C ambi-
ent temperature.
• Spinup power
Spinup power is measured from the time of power -on to the time that the dr ive spindle reaches opera ting speed.
• Seek mode
During seek mode, the read/write actuator arm moves towar d a specif ic position o n the disc surfa ce and does
not execute a read or write operation. Servo electronics are active. Seek mode power represents the worst-
case power consumption, using only random seeks with read or write latency time. This mode is not typical
and is provided for worst-case information.
• Read/write power and current
Read/write power is measured with the heads on track, based on a 16-sector write followed by a 32-msec
delay, then a 16-sector read followed by a 32-msec delay.
• Operating power and cu rrent
Operating power is measured using 40 percent random seeks, 40 percent read/write mode (1 write for each
10 reads) and 20 percent drive idle mode.
• Idle mode power
Idle mode power is measured with the drive up to speed, with servo electronics active and with the heads in
a random track location.
• Standby mode
During Standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/
write electronics are in power-down mode.
Table 4: DC power requirements
*During periods of drive i dle, some offline activity may occur according to the S.M.A. R.T. s pecifi cati on , whi ch ma y incr eas e acou s tic an d
power to operational levels.
Power dissipation (watts)
Example: ST3400832A Average
(watts, 25° C) 5V typ
amps 12V typ
amps
Spinup — — 2.8 (peak)
Idle 7.2 0.401 0.433
Idle* (with offline activity) 9.1 0.78 0.433
Operating (40% r/w, 40% seek, 20% inop.) 12.8 0.841 0.715
Seeking (random, 20% idle) 12.4 0.602 0.782
Standby 0.8 0.145 0.006
Sleep 0.8 0.145 0.006